Antenna



ROOM

w. QUNGE May 3,

ANTENNA Filed May 22,- 1936 lily/ Frequency Transm #fer 0r @ece/'Whg Appare/f0.5

-QQ/-M INVENTOR WILHELM RUNGE 714 ATTDRNEY Patented May 3, 1938 ANTENNA Wilhelm Runge, Berlin, Germany, assigner to Telefunken Gesellschaft Y fur Drahtlose Telegraphie', m. b. H., Berlin, Germany, a corporation of Germany Application May 22, 1936,. serial No. 81,231 In Germany June 4, 1935 2 Claims.

The present invention concerns an arrangement for protecting weatherproof` antennas against condensing water or sweat.

It has been proposed by the prior art, for the purpose of protecting antenna systems against the iniiuence of the weather, to dispose the entire antenna system or perhaps only their emitters in a container impervious to all but electric waves. This purpose of protecting the antenna and its emitters against external weather iniiuences and dirt is thus fully achieved. However, a new disadvantage now appears in that the relative humidity of the air in the interior of the container is so great that water is condensed or sweat formed on the walls of the container, the emitters and so forth, thus greatly affecting the antenna in its efficiency.

In accordance with the invention, this generation of sweat is prevented by decreasing the relative humidity of the air in the container enclosing the emitters.

In the drawing, Figs. 1, 2 and 3 illustrate different embodiments of the invention.

The principle of the invention shall be illustrated with the aid of Fig. 1. The dipole emitter D is disposed in the focus point of the rotation paraboloid mirror P and connected by power line L with transmitter F. In order to protect the inside of the mirror from weather and dirt, its open side is closed by means of a waterproof material Gr impervious to all but electric waves. Now, in order to prevent the formation of sweat inside the paraboloid, the screening tube T of the power line L is constructed in such manner that it conducts the warm air coming from the emitter box K to the parabolic mirror. At the upper end of the reflector is furthermore disposed the chimney S for the steady ventilation of the box. Due to this heating the relative humidity of the air has been decreased tosuch an extent that no sweat can form. To prevent the formation of water film in rainy weather on the shutting on plate G, hence no iilm that might inuence the electric waves, plate G is preferably made of a material having little adhesion to water so that the water runs oi quickly. Materials of this type are suciently known due to their use as windows and wind shields in automobiles.

Naturally, this example by no means covers the entire range of application of the idea of the invention, 'I'hus in Fig. 2 is shown a Christmas tree antenna with the dipole emitters D which are encased in a box P. The box is again closed in the direction of radiation by a plate G. The power line, not shown, again runs through a tube T which conducts the heat of emitter box K into (Cl. Z50-11) the antenna container which is ventilated at its upper end by chimney S.

In case economy makes it advisable not to enclose the entire antenna 'arrangement in a protecting container but only, as shown in Fig. 3, the parts disposed in the mirror Sp, namely the emitters and the power line which are not shown, these said parts can be heated separately. Power line and dipole emitter are encased in the insulating tube' T traversed by the heat from the emitter box K. Again a chimney S takes care of the ventilation.

The advantage ofthe invention will be evident from the fact that with practically no expense in materials the Weather protection of antennas is accomplished by using waste heat from the electron discharge tube systems for keeping the interior ofuthebox in dry condition, which waste heat would otherwise not-be used.

Itis, of course, understood that the idea of the invention is not limited to the fact thatthe drying of the container enclosingtlie'mitters is accomplished by the wastehveat of the transmitter or receiver. Separate heat sources can just as well be used for the drying as well as any other means. Thus special resistance heating devices can, l:for instance, be provided or then hygroscopic bodies may be disposedin the container.

What isclaimed is:

1. In combination, an aerial element, a power line for said aerial element, a weatherproof protecting container for said aerial element and power line, high frequency translating apparatus including electron discharge devices and 'an enclosing vessel therefor, said container extending to and communicating with said vessel whereby heat from said electron discharge devices in said'vessel flows throughthe interior of said container from the bottom thereof, and heat escape means at the top of said container for preventing sweat from forming in said container. Y

2. In combination, an aerial element, a power line for said aerial element, aV weatherproof protecting container for said aerial element and power line, said container including a paraboloid reector for said aerial element, high frequency translating apparatus including electron discharge devices and an enclosing vessel therefor, said container extending to and communicating with said vessel whereby heat from said electron discharge devices in said Vessel iiows through the interior of said container from the bottom thereof, and heat escape means'aithe top of said container for preventing sweat from forming in said container.

WILHELM RUNGE. 

